Math Olympiad: 20 flashcards
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1. What is the value of $7 \times 8 + 6 \times 5$?
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$7 \times 8 = 56$, $6 \times 5 = 30$, so $56 + 30 = 86$.
2. If a dozen is 12, how many items are in 5 dozen?
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$5 \times 12 = 60$ items.
3. What is the next number in the pattern: 2, 6, 12, 20, 30, ___?
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42. The differences are 4, 6, 8, 10, 12, so $30 + 12 = 42$.
4. Which number is missing? $45 + \_\_ = 72$
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$72 - 45 = 27$.
5. What is the perimeter of a square with side length 9 cm?
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$4 \times 9 = 36$ cm.
6. How many minutes are there in 2 hours and 15 minutes?
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$2 \times 60 + 15 = 135$ minutes.
7. What is the place value of 7 in the number 4,782?
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700 (seven hundreds).
8. If you buy 3 pencils at 5 rupees each and pay with a 20-rupee note, how much change do you get?
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Cost = $3 \times 5 = 15$ rupees; change = $20 - 15 = 5$ rupees.
9. What is the sum of the first 5 odd numbers?
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$1 + 3 + 5 + 7 + 9 = 25$.
10. Which is greater: $\frac{3}{4}$ or $\frac{2}{3}$?
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$\frac{3}{4} = 0.75$, $\frac{2}{3} \approx 0.666$, so $\frac{3}{4}$ is greater.
11. A rectangle has length 8 cm and width 5 cm. What is its area?
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$8 \times 5 = 40$ square cm.
12. What is the value of $100 - 25 \times 2$?
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$25 \times 2 = 50$, then $100 - 50 = 50$.
13. How many 25-paise coins make 5 rupees?
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5 rupees = 500 paise; $500 \div 25 = 20$ coins.
14. What is the next number in the pattern: 1, 4, 9, 16, 25, ___?
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36. These are squares: $1^2, 2^2, 3^2, 4^2, 5^2, 6^2$.
15. If today is Wednesday, what day will it be after 10 days?
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Saturday. 10 days = 1 week + 3 days; Wednesday + 3 days = Saturday.
16. What is the smallest 3-digit number formed by digits 5, 0, 8 without repetition?
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508. Arrange digits in ascending order, but 0 cannot be first.
17. A dozen eggs cost 48 rupees. What is the cost of 1 egg?
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$48 \div 12 = 4$ rupees.
18. What is the value of $6 \times (4 + 3)$?
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$4 + 3 = 7$, then $6 \times 7 = 42$.
19. How many sides does a hexagon have?
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6 sides.
20. What is the sum of angles in a triangle?
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$180^\circ$.
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